TAŞAN, H. Ercan Brandenburgische Technische Universität - Lehrstuhl Geotechnik, Germany , SAVİDİS, Stavros A. Technische Universität Berlin - Fachgebiet Grundbau und Bodenmechanik-Degebo, Germany , AKDAĞ, Cihan Taylan Dokuz Eylül Üniversitesi - Torbalı Meslek Yüksekokulu - Geoteknik Programı, Turkey

PORE WATER PRESSURE DEVELOPMENT AROUND THE MONOPILE FOUNDATIONS OF OFFSHORE WIND ENERGY CONVERTERS

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Offshore wind energy converters (OWECs) require specific foundations due to special loading conditions. Large diameter monopiles are widely proposed for OWECs. The behavior of large diameter monopiles under cyclic lateral loads was investigated in this study by means of numerical simulation with finite element method. Special focus is given to the pore water pressure accumulation around the monopile. For this purpose a fully coupled two-phase finite element (u20p8) is developed. A hypoplastic constitutive model for the saturated sand soil is used in the numerical analyses. The results revealed that, pile head displacement is strongly dependent on excess pore water pressure (EPWP) accumulation around the monopile. Subsequently, pile diameter-hydraulic conductivity interaction diagram was derived with a parametric study to estimate the pore water pressure accumulation potential. The proposed interaction diagram enables a preliminary design tool of monopiles for offshore wind energy converters in saturated sand soils.

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Offshore wind energy converters , monopiles , cyclic loading , hypoplastic model , fully coupled twophasemodel , numerical analysis , excess pore water pressure

Journal Of The Faculty Of Engineering an‎d Architecture Of Gazi University

341